1. Department of Medicine Teikyo University School of Medicine Tokyo Japan
2. Department of Gastroenterology Hiroshima Red Cross Hospital and Atomic‐bomb Survivors Hospital Hiroshima Japan
3. Division of Gastroenterology, Department of Internal Medicine Tokai University School of Medicine Isehara Japan
4. Department of Gastroenterology Kitasato University Medical Center Kitamoto Japan
5. Department of Gastroenterology and Hepatolpgy Gunma University Maebashi Japan
6. Department of Gastroenterology Fukuoka University Fukuoka Japan
7. Department of Gastroenterology and Metabology Ehime University Graduate School of Medicine Toon Japan
8. Department of Gastroenterology Mie University Tsu Japan
9. Department of Gastroenterology Fukushima Medical University Fukushima Japan
10. Department of Internal Medicine Heiannomori Memorial Hospital Hamamatsu Japan
11. Department of Internal Medicine and Gastroenterology Tokyo Women's Medical University Tokyo Japan
12. Department of Gastroenterology Kanazawa University Kanazawa Japan
13. Department of Gastroenterology Yamagata University Yamagata Japan
14. Department of Gastroenterology Kurashiki Medical Center Kurashiki Japan
15. Department of Gastroenterology and Hepatology Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences Okayama Japan
16. Division of Gastroenterology, Department of Medicine Kurume University Kurume Japan
17. Department of Gastroenterology Tokyo Medical University Ibaraki Medical Center Ibaraki Japan
18. Department of Gastroenterology Toyama University Hospital Toyama Japan
19. Department of Gastroenterology Aichi Medical University Nagakute Japan
20. Department of Gastroenterology Showa University Toyosu Hospital Tokyo Japan
21. Department of Gastroenterology Chiba University Chiba Japan
22. Department of Gastroenterology Juntendo University Tokyo Japan
23. Department of Gastroenterology and Hepatology Saitama Medical University Saitama Japan
24. Department of Gastroenterology St. Marianna Medical University Kawasaki Japan
25. Department of Gastroenterology and Hepatology, Faculty of Medicine Hokkaido University Sapporo Japan